Insulator for electrical conductors



(No Model.)

A. C. LEWIS.

INSULATOR FOR ELECTRICAL GONDUGTORS.

No. 255,800. Patented Apr. 4,1882.

WITNESSES: 3 INVBNTOB:.

ATTORNEY.

UNITED STATES PATENT OFFICE;

ALBERT C. LEWIS, OF BROOKLYN, NEW YORK.

INSULATOR FOR ELECTRICAL CONDUCTORS.

SPECIFICATION forming part of Letters Patent No. 255,800, dated April 4, 1882.

Application filed July 53, 1881. (X0 model.)

To all'whoin it may concern Be it known that I, ALBERT (J. LEWIS, a citizen of the United States, residing in Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Insulators for Conductors of Electric ity; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying (lrawings,formiug a part of this specification.

The object of my invention is to construct the head and shank of a spike, screw, nail, or bolt made of any metal capable of being forced into stone or brick work or wood, as a support, and an insulatingcap therefor, so that after such support shall have been driven or forced into its place the insulating-cap may be readily placed upon the support by hand and secured thereto by means of the openings and grooves or slots inside of the cap being so arranged as to receive such head and-shank in a way that when the cap has been properly adjusted thereon it cannot be removed without breaking, except by reversing the movements by which it was so adjusted. I obtain this object by means of the novel construction and adaptation of parts of the support to the inte rior construction of the insulatingcap.

Figure 1 represents that portion of the support upon which the insulating-cap is to be placed in proximity to a sectional perspective view of the insulating-cap. Fig. 2 represents a reverse plan view of the insulating-cap. Fi 3 represents a sectional View of the insulating cap, on the line 00 a: of Fig. 2, when placed upon the support and adjusted ready for use. Fi 4 is a section of the line y 3 of Fig. 3. Fig. 5 is a sectional view of a modification of the insulating-cap.

Similar letters refer to similar parts throughout the several views.

The cylinder A and the arm 0 represent the support for the insulating-cap. So much of this support as it is desired to force into the object to which it is sought to attach the insulator may be made of any suitable metal and form, as the inventor does not seek to cover such part by Letters Patent; butall that part of the support which is to be received within the insulating-cap, as from a to a, should be cylindrical in form, with the exception of the arm I), which projects outward from an are, c c, of a segment of the circle of a cylinder at its head or outer end.

The arm b may be of greater or less length, breadth, and thickness, according to the size ofthe insulating-cap with which itis to be used; but both the cylinder and cap should be of sufficient size to afford the strength necessary for the purpose for which they are to be used.

The insulating-cap D D maybe made of any suitable insulating material, and of such external form as may be desired, as the inventor does not seek to cover such parts by Letters Patent; but the interior base of the insulatingcap from c to 0 should be dome or hell like in form, that being recognized as the best form for the base ofinsulatiug-caps, especially where the support is not itselt'anon-conductor of electricity.

A cylindrical opening, and a slot, g, is cut through the top of the dome at 0 into the body of the cap. The cylindrical openingf is continued in a perpendicularline to thepointh. The slot g is continued in a perpendicular line at the side of and connected with the cylindrical openingf to the point i, where, in the form of construction represented in Figs. 1 and 3, the slot 9 is carried horizontally and at right augles a greater or less distance, as may be desired, around the cylindrical opening-say to the poiutj, where it passes upward and in a line with the cylindrical openingfto the point k, where it again is carried around the cylindrical openingf and parallel with the horizontal slot above described, a greater or less distance, to the point I, where it again passes upward in a line with the cylindrical opening f to the point m.

The slot 9 may be made to pass spirally partially around the cylindrical openingf from the point t to I, as shown in Fig. 5. This modification of the direction ofthe slot is in theinterest of economy in manufacture.

Allowance must be made for the expansion and contraction of the metals composing the parts.

What I claim, and desire to secure by Letters Patent 0f the United States, is-

The combination, in an insulator of conductors of electricity, of a metal support capable of being forced into stone or brick work or I slotg, extending from c to h and m, to receive wood, having that part of the shank next to the shank and arm of the support, all substan- 10 the head, as from a, to a, cylindrical in form, tially as set forth. the head being formed by the end of the cylin- 4 w V 1 ,7' 5 der a, and an arm. I), projecting outward there- ALBDRI from, with a movable or independent insulat- Witnesses: ing-c:1p,D D,having internallyan open (lome- \VALTER S. COWLES, like base, 0 c, and a cylindrical o )ening,f,and FRANK A. RANSOM. 

